<?php
/**
 * Zend Framework
 * LICENSE
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 * @category Zend
 * @package Zend_Validate
 * @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license http://framework.zend.com/license/new-bsd New BSD License
 * @version $Id: Digits.php 24593 2012-01-05 20:35:02Z matthew $
 */
/**
 *
 * @see Zend_Validate_Abstract
 */
require_once 'Zend/Validate/Abstract.php';

/**
 *
 * @category Zend
 * @package Zend_Validate
 * @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license http://framework.zend.com/license/new-bsd New BSD License
 */
class Zend_Validate_Digits extends Zend_Validate_Abstract {

    const NOT_DIGITS = 'notDigits';

    const STRING_EMPTY = 'digitsStringEmpty';

    const INVALID = 'digitsInvalid';

    /**
     * Digits filter used for validation
     * @var Zend_Filter_Digits
     */
    protected static $_filter = null;

    /**
     * Validation failure message template definitions
     * @var array
     */
    protected $_messageTemplates = array(self::NOT_DIGITS => "'%value%' must contain only digits", self::STRING_EMPTY => "'%value%' is an empty string", self::INVALID => "Invalid type given. String, integer or float expected");

    /**
     * Defined by Zend_Validate_Interface
     * Returns true if and only if $value only contains digit characters
     * @param string $value
     * @return boolean
     */
    public function isValid ($value) {
        if ( ! is_string ($value) &&  ! is_int ($value) &&  ! is_float ($value)) {
            $this -> _error (self::INVALID);
            return false;
        }
        $this -> _setValue ((string) $value);
        if ('' === $this -> _value) {
            $this -> _error (self::STRING_EMPTY);
            return false;
        }
        if (null === self::$_filter) {
            require_once 'Zend/Filter/Digits.php';
            self::$_filter = new Zend_Filter_Digits ();
        }
        if ($this -> _value !== self::$_filter -> filter ($this -> _value)) {
            $this -> _error (self::NOT_DIGITS);
            return false;
        }
        return true;
    }

}
